This comes from a customer.

I'm using Dartium and Dart Editor (Dart Editor version 0.4.3_r20602)

Consider this code:

import 'dart:html';
import 'dart:isolate';

childIsolate() {
  port.receive((msg, replyTo) {
    print('doing some work');
    if (replyTo != null) replyTo.send('shutdown');
  });
}

main() {
  var sender = spawnFunction(childIsolate);
  var receiver = new ReceivePort();
  receiver.receive((msg, _) {
    if (msg == 'shutdown') {
      print('shutting down');
      receiver.close();
    }
  });
  sender.send('do work please', receiver.toSendPort());
}

1. Load into Dart Editor, and set a breakpoint on the line "print('doing some work');"
2. Run the app in Dartium

Problem: no breakpoint is triggered.